Population Trends of Some Insect Pests of Rice Crop on Light Trap and its Relation to Abiotic Factors in Punjab Pakistan
Population Trends of Some Insect Pests of Rice Crop on Light Trap and its Relation to Abiotic Factors in Punjab Pakistan
Ijaz Haider1*, Muhammad Akhtar1, Ali Noman2 and Muhammad Qasim3
ABSTRACT
A research trial was conducted at Rice Research Institute, Kala Shah Kaku, Punjab, Pakistan to study the population fluctuation of five species of rice pests namely white stem borer Scirpophaga innotata (Walker), yellow stem borer Scirpophaga incertulas (Walker), rice leaffolder, Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae), whitebacked planthopper Sogatella furcifera (Horvath) (Homoptera: Delphacidae), and pink stem borer Sesamia inferens (Walker) (Lepidoptera: Noctuidae) on light trap. The effect of some abiotic factors like temperature, relative humidity and rainfall on the adult population of these pests was also studied. The population of these pests was monitored on the light trap from March to November from 2000 to 2014 in rice wheat cropping system. Yellow stem borer (YB), white stem borer (WB) and pink stem borer (PB) first appeared on the light trap in March when average temperature was 18°C. YB and WB had first peak population in mid-April at temperatures 30-33°C while second peak was observed in mid-September. Pink stem borer first peak population was observed in mid-March while second in mid-November. Rice leaffolder (RLF) started to appear in 3rd week of August. Peak population of whitebacked planthopper (WBPH) was observed in mid-October. Rainfall was found to be significantly positively correlated with WB population in March (0.821*) and October (0.884*). The population of yellow stem borer significantly and positively correlated with maximum temperature (0.773*) and minimum temperature (0.824*) in March and April respectively while it was negatively correlated with relative humidity (-0.832*) in April. Pink stem borer showed positive and significant relationship with rainfall (0.764*) and relative humidity (0.779*) in August and September respectively but negatively correlated with maximum temperature (-0.947**) in September. Rice leaffolder and whitebacked planthopper had positive and negative correlations with meteorological factors but they were non-significant.
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